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Liquid Handling

Jie Wang, Lingyu Sun, Minhan Zou, Wei Gao, Cihui Liu, Luoran Shang, Zhongze Gu, Yuanjin Zhao
Functional materials with specific surface wettability play an important role in a wide variety of areas. Inspired by nature's Nepenthes pitcher plant, we present a novel slippery film with tunable wettability based on a shape-memory graphene sponge. The porous graphene sponge coated with shape-memory polymer was used to lock in inert lubricants and construct slippery surfaces to repel different liquids. The superelasticity and high strength, together with good electrical conductivity, of the graphene sponge imparted the graphene/polymer hybrid films with fast recoverable shape-memory properties...
June 2017: Science Advances
Giuseppe Fisicaro, Luigi Genovese, Oliviero Andreussi, Sagarmoy Mandal, Nisanth N Nair, Nicola Marzari, Stefan Goedecker
We present an implicit solvation approach where the interface between the quantum-mechanical solute and the surrounding environment is described by a fully continuous permittivity built up with atomic-centered ``soft'' spheres. This approach combines many of the advantages of the self-consistent continuum solvation model in handling solutes and surfaces in contact with complex dielectric environments or electrolytes in electronic-structure calculations. In addition it is able to describe accurately both neutral and charged systems...
June 19, 2017: Journal of Chemical Theory and Computation
Hafiz H Salih, Jiaxing Li, Ruth Kaplan, Seyed A Dastgheib
Carbon dioxide (CO2) injection in deep saline aquifers is a promising option for CO2 geological sequestration. However, brine extraction may be necessary to control the anticipated increase in reservoir pressure resulting from CO2 injection. The extracted brines usually have elevated concentrations of total dissolved solids (TDS) and other contaminants and require proper handling or treatment. Different options for the handling or treatment of a high-TDS brine extracted from a potential CO2 sequestration site (Mt...
June 12, 2017: Water Research
X C Wang, F Zhang, N Jia, W Zhang, X Y Zhang, J Li, H Shao
Objective: To evaluate the inner or extra-exposure of workers in carbon and coal tar process industries. Methods: In May 2015, 271 exposure and 75 non-exposure workers in two of carbon and coal tar process industries in Shandong province were selected. Coal tar pitch (CTP) was detected according to the methods of GB17054-1997. The 1-OH-Nap、2-OH-Nap、1-OH-Pyr in urine were detected by high performance liquid Chromatography (HPLC) . Results: The concentration of 1-OH-Nap、2-OH-Nap、1-OH-Pyr in urine of exposure group were significant higher than that of control group (P<0...
April 20, 2017: Chinese Journal of Industrial Hygiene and Occupational Diseases
Gilda da Cunha Santos, Mauro A Saieg
With increasing requests for the evaluation of prognostic and predictive molecular biomarkers, great attention must be paid to the preanalytical issues regarding sample quality and DNA/RNA yield from all different types of cytological preparations. The objectives of this review were: 1) to provide an update regarding the importance of specimen triage as well as specimen handling and collection; 2) to discuss the different cell preparations that can be used for molecular testing, their advantages and limitations; and 3) to highlight the strategies for biobanking cytology samples...
June 2017: Cancer
Hao Jiang, Tingting Zhu, Hao Zhang, Jun Nie, Zeyi Guan, Chi-Ming Ho, Sheng Liu, Peng Fei
We report a novel fusion of droplet microfluidics and light-sheet microscopy, to achieve high-throughput sample compartmentalization, manipulation and three-dimensional imaging on a chip. This optofluidic device characterized by orthogonal plane illumination and rapid liquid handling is compact and cost-effective, and capable of preparing sample droplets with tunable size, frequency and ingredient. Each droplet flowing through the device's imaging region is self-scanned by a laser-sheet, three-dimensionally reconstructed and quantitatively analysed...
June 13, 2017: Lab on a Chip
Darius G Rackus, Richard P S de Campos, Calvin Chan, Maria M Karcz, Brendon Seale, Tanya Narahari, Christopher Dixon, M Dean Chamberlain, Aaron R Wheeler
Microfluidic platforms are an attractive option for incorporating complex fluid handling into low-cost and rapid diagnostic tests. A persistent challenge for microfluidics, however, is the mismatch in the "world-to-chip" interface - it is challenging to detect analytes present at low concentrations in systems that can only handle small volumes of sample. Here we describe a new technique termed pre-concentration by liquid intake by paper (P-CLIP) that addresses this mismatch, allowing digital microfluidics to interface with volumes on the order of hundreds of microliters...
June 12, 2017: Lab on a Chip
Stephanie Herman, Payam Emami Khoonsari, Obaid Aftab, Shibu Krishnan, Emil Strömbom, Rolf Larsson, Ulf Hammerling, Ola Spjuth, Kim Kultima, Mats Gustafsson
INTRODUCTION: Mass spectrometry based metabolomics has become a promising complement and alternative to transcriptomics and proteomics in many fields including in vitro systems pharmacology. Despite several merits, metabolomics based on liquid chromatography mass spectrometry (LC-MS) is a developing area that is yet attached to several pitfalls and challenges. To reach a level of high reliability and robustness, these issues need to be tackled by implementation of refined experimental and computational protocols...
2017: Metabolomics: Official Journal of the Metabolomic Society
Sh H Munawar, Z Iqbal, Z Manzoor
The objective of present study was to investigate renal clearance, urinary excretion and underlying excretory mechanism of marbofloxacin in Lohi sheep. For this purpose, marbofloxacin was administered intravenously (IV) as single bolus dose (2.5 mg/kg body weight) to eight healthy sheep of Lohi breed. After start of experiment, blood and urine samples were drawn at predetermined time intervals and marbofloxacin concentrations in the samples were measured by reverse phase high performance liquid chromatography (RP-HPLC) using UV/Vis detector...
2017: Iranian journal of veterinary research
Nadine Pinder, Thorsten Brenner, Stefanie Swoboda, Markus A Weigand, Torsten Hoppe-Tichy
INTRODUCTION: Therapeutic drug monitoring (TDM) is a useful tool to optimize antibiotic therapy. Increasing interest in alternative dosing strategies of beta-lactam antibiotics, e.g. continuous or prolonged infusion, require a feasible analytical method for quantification of these antimicrobial agents. However, pre-analytical issues including sample handling and stability are to be considered to provide valuable analytical results. METHODS: For the simultaneous determination of piperacillin, meropenem, ceftazidime and flucloxacillin, a high performance liquid chromatography (HPLC) method including protein precipitation was established utilizing ertapenem as internal standard...
May 22, 2017: Journal of Pharmaceutical and Biomedical Analysis
Min Li, Shuo Zhang, Aixin Shi, Wenyuan Qi, Yao Liu
A selective, sensitive and simple high performance liquid chromatography tandem mass spectrometric (HPLC-MS/MS) method for determining quetiapine in human plasma was developed and validated. One-step protein precipitation with acetonitrile was used to pretreat plasma samples. Carbamazepine was used as internal standard. An automated liquid handling workstation with 96-well protein precipitate plate was used to facilitate the process. The chromatographic separation was achieved on a Waters Xbridge C18 column (3...
May 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Silvia Taccola, Virginia Pensabene, Toshinori Fujie, Shinji Takeoka, Nicola M Pugno, Virgilio Mattoli
Free-standing films with sub-micrometric thickness, composed of soft polymers and functional nanostructures are promising candidates for many potential applications in the biomedical field, such as reduced port abdominal surgery. In this work, freely suspended poly(L-lactic acid) nanofilms with controlled morphology embedding superparamagnetic iron oxide nanoparticles were fabricated by spin-coating deposition. The mechanical properties of magnetic nanofilms were investigated by Strain-Induced Elastic Buckling Instability for Mechanical Measurements (SIEBIMM) test...
September 2017: Biomedical Microdevices
Claire Marie Filone, David Miller, Victoria Wahl-Jensen
The 50% tissue culture infectious dose (TCID50) endpoint dilution assay is one of the gold standard methods for measuring filovirus infectivity. We have increased virology microtitration assay throughput at biosafety level (BSL)-4 by implementing automated liquid handling and semi-automated assay endpoint readout. Utilization of automated liquid handling for cell plating and virus dilution along with optimization of the assay endpoint readout, using a luminescent-based cell viability assay and an automated plate reader, has improved workflow efficiency, reduced operator burden and assay time, decreased assay variability, and increased data return...
2017: Methods in Molecular Biology
Thiago Medeiros da Costa Daniele, Pedro Felipe Carvalhedo de Bruin, Emiliano Ricardo Vasconcelos Rios, Veralice Meireles Sales de Bruin
Exercise is a promising adjunctive therapy for depressive behavior, sleep/wake abnormalities, cognition and motor dysfunction. Conversely, sleep deprivation impairs mood, cognition and functional performance. The objective of this study is to evaluate the effects of exercise on anxiety and depressive behavior and striatal levels of norepinephrine (NE), serotonin and its metabolites in mice submitted to 6h of total sleep deprivation (6h-TSD) and 72h of Rapid Eye Movement (REM) sleep deprivation (72h-REMSD). Experimental groups were: (1) mice submitted to 6h-TSD by gentle handling; (2) mice submitted to 72h-REMSD by the flower pot method; (3) exercise (treadmill for 8 weeks); (4) exercise followed by 6h-TSD; (5) exercise followed by 72h-REMSD; (6) control (home cage)...
May 29, 2017: Behavioural Brain Research
David Kepplinger, Mandeep Takhar, Mayu Sasaki, Zsuzsanna Hollander, Derek Smith, Bruce McManus, W Robert McMaster, Raymond T Ng, Gabriela V Cohen Freue
The quantitation of proteins using shotgun proteomics has gained popularity in the last decades, simplifying sample handling procedures, removing extensive protein separation steps and achieving a relatively high throughput readout. The process starts with the digestion of the protein mixture into peptides, which are then separated by liquid chromatography and sequenced by tandem mass spectrometry (MS/MS). At the end of the workflow, recovering the identity of the proteins originally present in the sample is often a difficult and ambiguous process, because more than one protein identifier may match a set of peptides identified from the MS/MS spectra...
2017: PloS One
Yihao Wu, Qiqi Yin, Su Lin, Xiaoyan Huang, Quan Xia, Zhe Chen, Xingwei Zhang, Deye Yang
The kidney serves a central role in the control of blood pressure through the release of vasoactive substances and the urinary excretion of Na+. Patients with essential hypertension usually exhibit persistent high blood pressure accompanied by Na+ retention. L-dihydroxyphenylalanine (L‑DOPA) is an amino acid, converted by the enzyme aromatic L‑amino acid decarboxylase to dopamine. The uptake of L‑DOPA by cells of the proximal tubular epithelium of the kidney is controlled by the L‑type amino acid transporter 2 (LAT2)...
July 2017: Molecular Medicine Reports
Andrew V Grassetti, Rufus Hards, Scott A Gerber
Technological advances in liquid chromatography and tandem mass spectrometry (LC-MS/MS) have enabled comprehensive analyses of proteins and their post-translational modifications from cell culture and tissue samples. However, sample complexity necessitates offline prefractionation via a chromatographic method that is orthogonal to online reversed-phase high-performance liquid chromatography (RP-HPLC). This additional fractionation step improves target identification rates by reducing the complexity of the sample as it is introduced to the instrument...
May 29, 2017: Analytical and Bioanalytical Chemistry
Darrell D Marshall, Robert Powers
Metabolomics is undergoing tremendous growth and is being employed to solve a diversity of biological problems from environmental issues to the identification of biomarkers for human diseases. Nuclear magnetic resonance (NMR) and mass spectrometry (MS) are the analytical tools that are routinely, but separately, used to obtain metabolomics data sets due to their versatility, accessibility, and unique strengths. NMR requires minimal sample handling without the need for chromatography, is easily quantitative, and provides multiple means of metabolite identification, but is limited to detecting the most abundant metabolites (⩾1μM)...
May 2017: Progress in Nuclear Magnetic Resonance Spectroscopy
Jiefeng Xiao, Jia Li, Zhengming Xu
The large-batch application of lithium ion batteries leads to the mass production of spent batteries. So the enhancement of disposal ability of spent lithium ion batteries is becoming very urgent. This study proposes an integrated process to handle bulk spent lithium manganese (LiMn2O4) batteries to in situ recycle high value-added products without any additives. By mechanical separation, the mixed electrode materials mainly including binder, graphite and LiMn2O4 are firstly obtained from spent batteries. Then, the reaction characteristics for the oxygen-free roasting of mixed electrode materials are analyzed...
May 17, 2017: Journal of Hazardous Materials
Tao Yang, Ralph R Martin, Ming C Lin, Jian Chang, Shi-Min Hu
In this paper, we present a novel pairwise-force smoothed particle hydrodynamics (PF-SPH) model to allow modeling of various interactions at interfaces in real time. Realistic capture of interactions at interfaces is a challenging problem for SPH-based simulations, especially for scenarios involving multiple interactions at different interfaces. Our PF-SPH model can readily handle multiple kinds of interactions simultaneously in a single simulation; its basis is to use a larger support radius than that used in standard SPH...
May 19, 2017: IEEE Transactions on Visualization and Computer Graphics
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